Reclining chair



y 25, 1964 N. PlNl RECLINING CHAIR 3 Sheets-Sheet 1 Filed Dec. 20, 1960 VENTOR.

M1110 m BY W SW May 26, 1964 N. PlNl 'RECLINING CHAIR Filed Dec. 20. 1960 s She et s-Sheet 2 VEN TOR. \L

NW0 y y 26, 1964 N. PlNl RECLINING CHAIR Filed Dec. 20, 1960 3 Sheets-Sheet 3 INVENTOR. Mo K'M United States Patent This invention relates to improvements in or relating to easy-chairs or reclining chairs and it is more particularly concerned with easy-chairs of the type including a structure and seat and back forming portions movably connected to said structure and means for securing said movable portions to said structure in differing relative positionswhereby the said easy-chair may be alternatively set either in a sitting position for comfortable seating of the user and in relax position for proper rest and relaxand wherein the relative movements of said movable portions may be directly caused by shifting the weight and exerting a certain pressure of back and thighs of the user, without any particular handling of ancillary locking and un-locking means.

It is known that a number of such self-adjusting easychairs had been heretofore proposed and sold. Such easy-chairs are however subject to several objections, namely: in general, the considered piece of furniture includes seat and back forming portions supported by a frame structure by means of a rather complicated leverage including pivotally interconnected members and components designed for meeting a balanced relationship of the load weighing down on the easy-chairs seat portion with respect to the load supported by the back portion, and the said easy-chair portions are dimensioned and relatively located for proper adaptation to the human body.

Therefore, it may be said that the currently produced self-adjusting easy-chairs as above may be satisfyingly used by persons, of medium or regular size and weight only, while the proper balance would be prejudiced when differently sized and proportioned persons make use of thechair. In general, the prior self-adjusting easy-chairs of the character considered show a tendency to move towards their elongated or relaxrposition as tall persons sit thereon; a pretty short man would not be capable of maintaining the chair in its relax position. An easychair which could be adapted for differently sized human beings and which might be effortlessly maintained in any of its sitting and relax positions should he therefore desirable.

Having the above and other objections and considerations in mind, it is a principal object of this invention to provide a self-adjusting easy-chair of the above type, which includes a frame structure, a seat portion and a back portion pivotally connected to said frame structure, and a leverage inter-connecting said portions so that both said portions may be shifted from a sitting position to a relax position by a substantially effortlessv pressure of the users back on said back portion, irrespectively of the weight and of the stature of said user, said leverage including means for causing said portions to remain in said relax position, and an ancillary fore-leg or feet supporting portion pivotally connected to said seat portion and controlled by said leverage so that as said seat and back portions are shifted towards said relax position said feet por- 3,134,623 Patented May 26, 1964 tion is in turn shifted toward an extended feet supporting position.

A further object of this invention is to provide a new and advantageous self-adjusting easy-chair of the above type, including a seat portion pivotally connected to a stationary frame structure at its rear edge portion and connected by means of the said leverage to the other portions of the chair so that as said chair portions are shifted towards said relax position the fore part of said seat portion,

is caused to be noticeably lifted-whereby a more raised and relaxing position of the users legs and knees may be attained.

In another aspect of the present invention, the easychair includes a frame structure, a seat portion and a back portion pivotally connected to said frame structure, and arm supporting portions connected to said seat and' back portions so that as said latter portions are shifted towards either of said sitting and relax positions said arm portions are caused to shift too into a position correlated to the position of said seat and back portions for comfortable supporting of the users fore-arms accordnigly with the users body posture.

In a further aspect of this invention, the easy-chair includes a frame structure, a seat portion pivotally connected to said frame structure, a back portion pivotally and detachably connected to said structure and arm portions pivotally and detachably connected to said back portion and to said frame structure, whereby said back and arm portions may be easily detached from said structure and from said seat portion to facilitate the storage and transportation of the piece of furniture.

The novel features of the present invention are set forth in the appended claims. The present invention however,

' both as to its construction and operation, together with further objects and advantages thereof, will be best understood by way of illustration and example by the following detailed description of a preferredform of embodiment thereof, when taken in conjunction with the accompanying drawings, forming an essential component of this disclosure, and wherein:

FIGURE 1 is a perspective view of the easy-chair of theinvention, as set in its relax position;

FIGURE 2 is a similar view of the easy-chair in its raised or sitting position;

FIGURE 3 is a side view of the easy-chair frame struc-.

ture and of parts of its leverage, as seen from plane and in the direction indicated at 3-3 in FIG. 9, and wherein the several seat, back and arm portions are out-lined by dot-and-dash lines, in sitting position;

FIGURES 4 and 5 are side views of details of the leverage, seen from planes indicated at 44 and 5-5, respectively, in FIG. 3, and in corresponding sitting positions;

FIGURE 6 illustrates thee frame structure and the leverage of FIG, 3, as set in relax position of the easy-chair;

FIGURES 7 and 8 illustrate the details of FIGS. 4 and 5, respectively, in. corresponding relax position;

FIGURE 9 is a plan view from above of the frame structure and of the leverage included inv the easy-chair of the invention;

FIGURE 10 illustrates in exploded view, partly sectionaland partly in side elevation, the detachable components of the easy-chair;

IGURE 11 illustrates in exploded view the detail of an attachment device for connection of the fore part of an arm portion of the easy-chair; and

FIGURE 12 is an exploded view partly in elevation and partly sectional in the ditfering planes indicated at 1212 and 12-12 in FIG. 10, of a detail of a connecting means for detachably connecting the rear part of an arm portion to the adjacent part of a back portion of the easy-chair.

Like numerals refer to like parts, members and components of the easy-chair thoroughout the several figures. Referring first to FIGS. 1 and 2; the new easy-chair includes, in its broadest aspect, a seat portion generally indicated at 20, a back portion 21 and arm portions 22. As the easy-chair is set for relax (FIG. 1), a further leg supporting portion, generally indicated at 23, is extended from the fore edge of said seat portion while as the chair is set for comfortable but substantially up-right sitting (FIG. 2), the leg supporting portion 23 is retracted and fully concealed beneath the seat portion 20.

In general arrangement of the said components of the easy-chair, the leg supporting portion 23 is pivotally connected at 24 (FIG. 3) to said fore edge of seat portion Zil, and the back and seat portions 21 and 29 are supported by a preferably metal made frame structure, generally indicated at 25 in FIGS. 3, 6 and 9, and provided with supporting legs 26 integrally formed therewith, the legs being preferably connected to rubber coated feet 27 for slipless resting of the piece of furniture on the floor.

The back, seat, leg supporting and arm portions of the easy-chair include their own convenionally constructed frame structures, preferably but not necessarily made of wood, and properly shaped soft and resilient coverings, of foam rubber for example, said structure and coverings are not hereby described in detail as they are well known in the art to which this invention appertains. Such portions and structures will therefore be indicated only as necessary for making readily apparent their connection to other components of the construction.

The seat portion 20 and its structure, partly shown and indicated at 28 in FIG. 10, is pivotally connected by hinge means at 29 to the transverse rear edge part 30 (FIGS. 3, 6 and 9) of the frame 25, and likewise the lower edge portion 31 (FIG. 10) of the seat portion and structure is pivotally connected by hinge means at 32 to the same transverse rear part 30 of frame 25. The rear parts of arm portions 22 are pivotally connected at 33 to the adjacent side parts of back portion 21, and the fore parts of arm portions 22 are pivotally connected at 34 to upwardly extended braces 35 which are pivotally connected at 36 (FIGS. 46 and 9) to the side frame portions 37 of said frame structure.

As a result of the pivotal connections of said portions, the described components of the easy-chair of the invention may be shifted in several differing directions in dependency of the linkage embodied by the particular leverage described below. chair of the invention is set at its sitting position of FIG. 2, by applying a substantially effortless pressure on the upper part 63 of the back portion 21, namely by a rearwardly directed pressure of the seaters head, the fore part of the seat portion 2t pivoted at 29, will be noticeably raised in direction A, while the back portion 21, pivoted at 32, will be rearwardly inclined in direction B. In the meantime, the arm portions 22 will move in a combined rearward and downward direction C and the fore leg portion 23 will perform a rotation through about 180 in direction D, whereby all the above described components will reach the respective positions shown in FIG. 1, wherein the easy-chair appears to be set for comfortable relaxing.

As said relax position is attained the various portions will remain in such position, irrespective whether any person will use or not use the chair, which is an important feature of the invention. According to another important feature of this invention, the lowering of the back portion 21 by pivoting in direction B, is accompanied by a substantial raising of the fore part of seat portion 21 which pivots in direction A. Such combined motions Supposing that the new easy-' of portions 20 and 21 ensure the balance of the chair under the load of persons of differing height, because it is obvious that the weight of a human being is substantially divided according to a substantially uniform ratio between his various parts and, for example, the load applied to the back portion 21 by the heavy bust and shoulders of a tall and strongly built man will be balanced by the weight of proportioned thighs and legs on the fore part of seat portion 26, so that the balance of the chair is ensured irrespectively of the weight and stature of the user.

In addition, the greater inclination of the seat portion 21 and its raised fore part make the easy-chair of the invention most comfortable for relaxing and even for sleeping thereon, because the users legs will be correctly supported at a substantial angle beneath their knees.

Further, the arm portions 22, being rearwardly and downwardly shifted in direction C (FIG. 2) into the position of PEG. 1, will ensure "a correct and comfortable support of the users arms and fore-arms in a position well correlated with the reclining posture of the relaxing person.

For restoring the easy-chair to its sitting position of FIG. 2, a substantially effortless downwardly directed pressure exerted on the leg portion 23 will start a reverse motion of all described parts and components, said reverse motion being continued by spring means included in the construction, as described below, while slowed down by braking means to prevent any undesirable shock due to a too fast return motion of back portion 21.

The above briefly described particular movements and advantages of the components of the easy-chair of the invention are attained by the provision of the particular leverage, namely of the links, connections and mechanism which will be described with reference to FIGS. 3 to 9 inclusive.

The fore part of the seat portion 20, reinforced by suitable metal made plates 38 (FIGS. 3, 4 and 6 to 9) is supported above the lower L-shaped portions 39 of said braces 35, extended below the pivotal connection at 36 of said braces to the side fore portions 37 of the frame structure 25. The support is embodied by substantially vertical connecting links 41 pivotally connected at their upper and lower ends, at 42 and at 40, respectively, to the respective adjacent plates 38 and lower brace portion 39. Such linkage causes the correlation of the motions A and B (FIG. 2) of seat portion 20 and respectively of back portion 21 of the chair. In fact, as the back portion 21 will be backwardly tilted about its pivotal connection at 32 with respect to the stationary frame structure, the motion of the pivotal connection at 33 (see particularly FIGS. 3 and 6), which will describe the arc C of FIG. 6, will cause the arm portions 22 to follow such motion. The fore parts of the arm portions 22, which are pivotally connected at 34 to the braces 35, which in turn are pivotally connected 36 to the stationary frame structure, will describe an arc C (FIG. 6) and cause the braces 35 to turn clockwise about their pivots at 36.

The movement of the arm portions along the arcs C and C will bring the same in their proper relax position with respect to the other components of the easychair, and the described rotation of braces 35 will cause the upward motion A (FIGS. 2 and 3) of the fore part of the seat portion 20 of the chair. Such movement is used for forwardly rotating and extending also the leg supporting portion 23, into the position shown in FIGS. 1 and 7 and partially in FIG. 6, by means of further suitable leverage shown in a preferred form in FIGS. 4, 7 and 9 and, partially in FIG. 3 and including a motion multiplier mechanism to transform the relative small rotational motion of the above described components into a relative large rotation of said leg supporting portion 23 as necessary for bringing the same from its fully concealed position beneath the seat portion 20 (FIGS.v

2, 3 and 4) to its extended leg sustaining relax position (FIGS. 1, 6 and 8).

Said further levenage includes a cross member 43 fixedly connected to said lower portions 39 of braces and transversely extended therebetween. Such cross member additionally adds strength to the movable structure and ensures the uniform movement of the various parts thereof. Such member therefore follows the motion of said lower portions 39 of braces 35 during the above described shifting of portions 29 and 21 from sitting to relax position of the easy-chair.

A two-armed lever 44 is rotatably supported on the cross member 43 (FIGS. 4, 7 and 9). Such lever 44 has an upper end portion pivotally connected at 45 to a connecting link 46 which is in turn pivotally connected at 47 to a stationary cross rod 48 fixedly secured to the stationary frame structure 25- and transversely extended between side, portions 49 thereof (FIGS. 3 and 9). The stationary cross rod 48 additionally increases the mechanical strength of the frame structure 225. The opposite lower end portion of said two-armed lever 44 is pivotally connected at 51 to a further rod-shaped connecting link having a fore part pivotally connected at 52 to the oscillatable leg supporting portion 23. Preferably, the latter connecting linkrinclu-des a rod having a screwthreaded fore end portion screwly engaged within a tubular member '54 integrally formed with an extension 53 wherein the pivotal connection at 52 is provided, the screw engagement between parts 50 and 54 being provided for adjustment purpose, in particular for adjusting the leverage to obtain the desired inclination of leg supporting portion 23 when extended in its relax position.

The desired amplitude of motion is obtained by the operation of the two-armed lever 44, whose lower end portion including the pivotal connection at 51 is caused to travel along a path over a distance substantially twice the distance covered by its center which follows the travel of cross member 43 together with the assembly including said braces 35, 39.

The means provided for causing the various portions of the easy-chair to stay at their relax position and for facilitating the return movements towards the sitting position includes resilient means, namely coil springs 55 each having-one end portion secured at '56 to the side portions 49. of the stationary frame structure 25 and another end portion connected, by means of links '57, to a point 58 appertaining to the oscillatable braces 35.

Aswit may be readily understood from a consideration of FIGS. 3 and 6, the spring means at 55 is located for exerting a pulling force on point 58 which moves along an arc about the pivotal connection at 36, the force being extended between points at 56 and 58 and therefore along a line defined by said points. When said point at 58 is atits lowermost position, corresponding to the sitting position of the easy-chair (FIG. 3), said line of pull passes below pivotal connection at 36, and therefore the springs 55 tend to maintain the chair in its sitting position. Said springs are loaded to resist a reasonable leaning back of the seating person against the easy-chair back portion 21.

As the various components of the chair are set at the relax portion (FIG. 6), the three points 58, 36 and 56 are substantially aligned and therefore, while the springs 55 are fully loaded, no component of such force is directed to rotate back said braces 35 towards the sitting position of FIG. 3, and the easy-chair tends to stay in said relax position. A small disalignment of said points 58, 36 and 56, so that the line of pull defined by point 56 and 58 may pass slightly above the pivotal point at 36, may advantageously improve the tendency of staying in the relax position, if desired.

For shifting the easy-chair again into its sitting position of FIGS. 2 and 3, a relatively small return movement of its various portions towards said sitting position will modify the above stated alignment of points and as the line of pull defined by points at'56 and 58 will be substantially below pivotal point at 36 the return movement will continue under the action of springs 55, without further effort. In actual use of the easy-chair, such selfcontinuing return movement towards the sitting position may be started simply by downwardly pressing on leg supporting portion 23, such pressing being a consequence of natural action of the seater when desirous of rising up from the chair, because such action includes the shifting of the seaters back from the back portion 21 and the increasing of the load of his thighs and legs on the fore part of portion 20 and on leg portion 23.

From the above it will be understood that relatively powerful spring means, namely powerful springs 55, will improve the operation of the easy-chair, because more powerful spring means lead to a greater supporting ability of back portion 21 when the chair is set for sitting and to a surer shifting back of the chair from is relax position to said sitting position. From a differing standpoint of view, relatively powerful return spring means may cause the strongly objectionable effect that the return movement may be performed too fast, so that swinging back portion 21 might disturb the seater, who may not be correspondingly prompt in rising-up.

According to an ancillary feature of the invention, such latter objectionable effect might be however overcome by providing the chair with suitable braking means designed for slowing down the return movements of components. towards their sitting position. A conventional telescope-type amortizer 59 (FIGS. 5, 8 and 9), i.e. of the type currently applied to cars or motorcycles for preventing the well known rebouncing effect of suspension springs, and therefore not shown and described in detail, may be connected between a stationary part of the frame structure 25, an extension 63 of said frame, for example, and a point appertaining to the movable assembly, a pivot 61 secured to arms 62 integral with said cross member 43 for example, said braking means 59 including an air or friction braked piston, for example, according to current art, and being adjusted for ensuring a reasonably slow return movement.

In FIGS. 10 to 12 there is shown a preferred construction of the easy-chair of the invention, including means for facilitating the disassembling of the same for storage, crating and transportation purposes. According to an ancillary feature of the invention, the back portion 21 is detachably connected to hinge means at 32, by means of bolts secured to the framing 31 of said back portion and of winged nut, for example, as shown in FIG. 10.

Further, the pivotal connections at 33 and 34 are constructed for permitting prompt detachment of said arm portions 22 from the adjacent back portion 21 and braces 35.

For example, a plate 64 (FIGS. 10 and 11) is oscillatably secured at 34 to said arm portion 22 and designed for snugly fitting of the upper part of the respective brace 35 thereinto. A lock means 65 formed with resilient steel wire having spring forming coils at 66 is provided for snapping Within a notch 67 formed in said brace 35. A

wedge portion 68 facilitates the fitting of said brace in said plate 64 in locked relationship therewith and said loc. means 65 may be released from notch 67 by acting on an extension 69 of said wire.

In the pivotal connection at 33 (FIGS. 10 and 12), the pivot is embodied in a pin 70 secured to and extended from the rear part 71 of arm portion 22, the said pin being integral with a smaller radial pin 72. The socket means of the pivotal connection is embodied by a tubular member having a bore 73 and embedded in the framing 31 of the back portion, and covered by a cover plate 74 having a hole adapted for passage of said pin 70 and provided with a key-hole type radial notch 75. Such notch 75 is upwardly directed and the radial pin 72; is substantially parallel to the parent arm portion 22, so that such pin 70 may be introduced into said bore 73 only if the parent arm portion 26 is substantially vertical, i.e. in a position well differing from the positions which said arm portion may assume in the easy-chair assembled for use. The cover plate 74 covers a rounded chamber 76 co-axial to the bore 73 and wherein the radial pin 72 may freely rotate upon its passage through said notch 75.

It is obvious that storage and transportation of the easy-chair will be greatly facilitated by detachment of its back portion 21 and arm portions 22. Re-assembling of the easy-chair requires simple operations only, i.e. including the steps of securing of the back portion 21 to the hinge means at 32, of putting the arm portions in vertical direction and then fitting the pins 70 into the bores 73, and of swinging said arm portions downwardly (thus locking said pins '70 in the bores 73) and fitting the said upper parts of braces 35 into the plates 64 until the lock means 65 snap into the parent notches 67. It will be appreciated that the above operations do not require tools and may be readily performed by quite unskilled persons.

It is believed to be evident that the invention provides a plurality of advantageous features, and it will be understood that each of the new features described and shown and any combination thereof may also find useful application in other easy-chair of relax type differing from the one described.

Without further consideration, the foregoing will so fully reveal the gist of this invention that others can, by applying current knowledge, readily adapt it for other applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of this invention and, therefore, such adaptations should and are intended to be comprehended within the spirit and meaning of this invention as above set forth and defined in and by the appended claims.

Having thus described the invention, what I claim as new and desire to have protected by Letters Patent of the United States of America is:

1. In a reclining chair of the character described, the combination of: a stationary frame structure having a rear transverse part and substantially parallel side parts having forwardly extended fore end portions and chair supporting leg portions integrally formed therein; an upwardly extending back portion having a lower horizontal edge, substantially vertical and parallel side parts and pivotally and detachably connected at said lower edge thereof to said rear transverse part of said stationary frame for swinging movement between a substantially upright sitting position and a substantially rearwardly inclined relax position; a seat portion located above said frame structure, having a fore part and a rear transverse edge part pivotally connected to said transverse part of said stationary frame for swinging movement between a substantially horizontal sitting position and a relatively inclined relax position wherein said fore part of said seat portion is substantially raised; a leverage including essentially vertical braces pivotally connected to said extended fore end portions of said stationary frame and having an upper and a lower end part in respect to their pivotal connection; supporting arm portions pivotally and detachably connected to said upper parts of said braces and to said side parts of said back portion to form a connecting link therebetween, link members having upper and lower ends pivotally connected to said fore part of said seat portion and respectively to said lower end parts of said braces to support said fore portion on said braces, whereby said seat portion is caused to swing towards its relax position as said back portion is swung towards its relax position, via said arm portions forming connecting link, said braces and said link members; spring means connected to a stationary point appertaining to said frame structure and to a movable point appertaining to said braces and in variable alignment relationship with the said pivotal connection of said braces, adapted for springly exerting a force on said braces causing the said seat and back portions to self-return from their relax position to their sitting position; and braking means connecting said leverage braces to said stationary frame structure for slowing down said self-return.

2. In a reclining chair of the character described, the combination of: a stationary frame structure having a rear transverse part and substantially parallel side parts having forwardly extending fore end portions and chair supporting leg portions integrally formed therein; an upwardly extending back portion having a lower horizontal edge, substantially vertical and parallel side parts and pivotally and detachably connected at its said lower edge to said rear transverse part of said stationary frame for swinging movement between a substantially upright sitting position and a substantially rearwardly inclined relax position; a seat portion located above said frame structure, having a fore part and a rear transverse edge part pivotally connected to said transverse part of said stationary frame for swinging movement between a substantially horizontal sitting position and a relatively inclined relax position wherein said seat portion fore part is sub stantially raised; a leg supporting portion having a rear edge adjacent and pivotally connected to said fore part of said seat portion for swinging movement between a sittting position wherein said leg portion is concealed beneath said seat portion and a relax position wherein said leg portion is forwardly extended from said seat portion; a leverage including essentially vertical braces pivotally connected to said extended fore end portions of said stationary frame and having an upper and a lower end part in respect to their pivotal connection, supporting arm portions pivotally and detachably connected to said upper part of said braces and to said side parts of said back portion to form a connecting link therebetween, link members having upper and lower ends pivotally connected to said seat portion fore part and respectively to said lower end part of said braces to support said fore portion on said braces, whereby said seat portion is caused to swing towards its relax position as said back portion is swung towards its relax position, via said arm portions forming connecting link, said braces and said link members, and further link components for drivingly connecting said leg supporting portion to said braces, whereby said latter portion is caused to swing towards its relax position as said other back and seat portion are swung towards their relax position; spring means connected to a stationary point appertaining to said frame structure and to a movable point appertaining to said braces and in variable alignment relationship with the said pivotal connection of said braces, adapted for springly exerting a force on said braces causing said seat, back and leg portions to self-return from a position substantially spaced from their relax position to their sitting position; and braking means connecting said braces to said stationary frame structure for slowing down said self-return.

3. A reclining chair comprising, in combination, a supporting frame; a seat portion having a fore part and a rear part pivotally connected to said supporting frame; a back portion pivotally connected at a lower end thereof to said frame for swinging movement between a substantially upright position to a rearwardly inclined end position; first linkage means including at least one elongated lever arm pivoted intermediate the ends thereof at a first pivot point to said support frame and link members pivotally connected to said seat and back portions for causing said fore part of said seat portion to swing upwardly during swinging motion of said back portion to said rearwardly inclined end position thereof; and tension spring means connected at one end thereof to a fixed point of said supporting frame and at the other end thereof to a component of said linkage means pivoted to said elongated lever arms thereof at a second pivot point spaced from said first pivot point for exerting when said back portion of said reclining chair is in a position essentially differing from its rearwardly inclined end position on said 9 10 back portion a force component tending to move said References Cited in the file of this patent back portion to its upright position and said first and sec- UNITED STATES PATENTS ond p1vot pomts bemg arranged with respect to each other and to said fixed point of said supporting frame i h 228,869 CIOIIgh June 15, 1880 a manner that when said back portion i in it rearwardly 5 2,533,595 L k a Dec. 12, 1950 inclined end position said pivot points and S i fi ed point 2,579,502 L renz Dec. 25, 1951 of Said frame 110 WhiCh the One end of said spring means 2873791 ep acke Feb. 17, 1959 iS COIIHECtGd are located along a straight line so that; said 2,892,484 'fif June 30, 1959 spring means will exert no force component tending to 2,918,112 hh phacke Dec. 22, 1959 move said back portion from its rearwardly inclined end 10 2,968,339 Hqifm n Jan. 17, 1961 position to the upright position thereof, 2,974,720 lmek Mar. 14, 1961 3,065,989 Mohler Nov. 27, 1962 

1. IN A RECLINING CHAIR OF THE CHARACTER DESCRIBED, THE COMBINATION OF: A STATIONARY FRAME STRUCTURE HAVING A REAR TRANSVERSE PART AND SUBSTANTIALLY PARALLEL SIDE PARTS HAVING FORWARDLY EXTENDED FORE END PORTIONS AND CHAIR SUPPORTING LEG PORTIONS INTEGRALLY FORMED THEREIN; AN UPWARDLY EXTENDING BACK PORTION HAVING A LOWER HORIZONTAL EDGE, SUBSTANTIALLY VERTICAL AND PARALLEL SIDE PARTS AND PIVOTALLY AND DETACHABLY CONNECTED AT SAID LOWER EDGE THEREOF TO SAID REAR TRANSVERSE PART OF SAID STATIONARY FRAME FOR SWINGING MOVEMENT BETWEEN A SUBSTANTIALLY UPRIGHT SITTING POSITION AND A SUBSTANTIALLY REARWARDLY INCLINED RELAX POSITION; A SEAT PORTION LOCATED ABOVE SAID FRAME STRUCTURE, HAVING A FORE PART AND A REAR TRANSVERSE EDGE PART PIVOTALLY CONNECTED TO SAID TRANSVERSE PART OF SAID STATIONARY FRAME FOR SWINGING MOVEMENT BETWEEN A SUBSTANTIALLY HORIZONTAL SITTING POSITION AND A RELATIVELY INCLINED RELAX POSITION WHEREIN SAID FORE PART OF SAID SEAT PORTION IS SUBSTANTIALLY RAISED; A LEVERAGE INCLUDING ESSENTIALLY VERTICAL BRACES PIVOTALLY CONNECTED TO SAID EXTENDED FORE END PORTIONS OF SAID STATIONARY FRAME AND HAVING AN UPPER AND A LOWER END PART IN RESPECT TO THEIR PIVOTAL CONNECTION; SUPPORTING ARM PORTIONS PIVOTALLY AND DETACHABLY CONNECTED TO SAID UPPER PARTS OF SAID BRACES AND TO SAID SIDE PARTS OF SAID BACK PORTION TO FORM A CONNECTING LINK THEREBETWEEN, LINK MEMBERS HAVING UPPER AND LOWER ENDS PIVOTALLY CONNECTED TO SAID FORE PART OF SAID SEAT PORTION AND RESPECTIVELY TO SAID LOWER END PARTS OF SAID BRACES TO SUPPORT SAID FORE PORTION ON SAID BRACES, WHEREBY SAID SEAT PORTION IS CAUSED TO SWING TOWARDS ITS RELAX POSITION AS SAID BACK PORTION IS SWUNG TOWARDS ITS RELAX POSITION, VIA SAID ARM PORTIONS FORMING CONNECTING LINK, SAID BRACES AND SAID LINK MEMBERS; SPRING MEANS CONNECTED TO A STATIONARY POINT APPERTAINING TO SAID FRAME STRUCTURE AND TO A MOVABLE POINT APPERTAINING TO SAID BRACES AND IN VARIABLE ALIGNMENT RELATIONSHIP WITH THE SAID PIVOTAL CONNECTION OF SAID BRACES, ADAPTED FOR SPRINGLY EXERTING A FORCE ON SAID BRACES CAUSING THE SAID SEAT AND BACK PORTIONS TO SELF-RETURN FROM THEIR RELAX POSITION TO THEIR SITTING POSITION; AND BRAKING MEANS CONNECTING SAID LEVERAGE BRACES TO SAID STATIONARY FRAME STRUCTURE FOR SLOWING DOWN SAID SELF-RETURN. 